If the IAT sensor is downstream of where the PCV system picks up it's air, the PCV system is your culprit.

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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.

The IAT is exactly after where the intake tube crosses over the valve cover...the valve cover vents into the intake cross over tube rigth before the IAT ....i was not aware that these cars had a pcv system other than what i described. nothing is changeable or adjustable in that setup. am i missing something?

thanks,,

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1993 300E, 2.8 M104 .....